| 12/31/2018 | ||||||
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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| March, Roy | SP | Lloydminster Lynx | 20 | 11/05/1998 | Oshawa | CAN | Right | Right | 5' 9" | 220 lbs | - |
| Marletti, Antonio | SS | Colorado Commanders | 29 | 03/04/1989 | Verona | ITA | Left | Right | 6' 1" | 190 lbs | - |
| Marshall, Dave | SS | Free Agent | 24 | 06/16/1994 | Washington | USA | Left | Right | 6' 0" | 195 lbs | - |
| Marshall, Ethan | 1B | Seattle Rainiers | 19 | 05/02/1999 | Chicago | USA | Left | Left | 6' 3" | 160 lbs | - |
| Martin, Bill | CF | Free Agent | 27 | 04/10/1991 | Theodore | USA | Right | Right | 6' 2" | 183 lbs | - |
| Martin, Carl | RF | Colorado Commanders | 22 | 05/26/1996 | Frankenmuth | USA | Right | Right | 5' 11" | 170 lbs | - |
| Martínez, Albert | 2B | Colorado Commanders | 25 | 04/23/1993 | Bonao | DOM | Right | Right | 6' 0" | 185 lbs | - |
| Martínez, Anastasio | 2B | Free Agent | 23 | 03/19/1995 | Beaverton | USA | Right | Right | 6' 0" | 200 lbs | - |
| Martínez, Ángel | MR | Seattle Rainiers | 24 | 10/14/1994 | Virginia Beach | USA | Left | Left | 6' 6" | 245 lbs | - |
| Martínez, Fernando | SP | Surrey Sinners | 24 | 11/14/1994 | San Juan | PUR | Right | Right | 6' 1" | 215 lbs | - |
| Martínez, Gonzalo | SP | Jasper Cougars | 21 | 12/17/1997 | Guantanamo | CUB | Switch | Left | 6' 3" | 255 lbs | - |
| Martínez, Héctor | 1B | Lloydminster Lynx | 23 | 04/13/1995 | Damas | CRC | Left | Right | 5' 9" | 195 lbs | - |
| Martínez, Juan | MR | Free Agent | 26 | 11/01/1992 | San Diego | USA | Switch | Right | 6' 1" | 195 lbs | - |
| Martínez, Luis Antonio | MR | Saskatoon Smokin' Guns | 25 | 08/14/1993 | Jarabacoa | DOM | Right | Right | 6' 2" | 197 lbs | - |
| Martínez, Miguel | MR | Seattle Rainiers | 23 | 06/24/1995 | Corona | USA | Right | Left | 5' 10" | 230 lbs | - |
| Martínez, Pedro | MR | Jasper Cougars | 24 | 07/01/1994 | Fort Kent | USA | Left | Right | 6' 0" | 195 lbs | - |
| Martínez, Rubén | MR | Free Agent | 24 | 04/11/1994 | Pocahontas | USA | Right | Right | 6' 1" | 240 lbs | - |
| Mason, Dan | LF | Colorado Commanders | 20 | 05/25/1998 | Brooklyn | USA | Right | Left | 6' 2" | 160 lbs | - |
| Mayes, Ron | 1B | Saskatoon Smokin' Guns | 22 | 05/14/1996 | West Fargo | USA | Left | Left | 6' 2" | 200 lbs | - |
| McCalmont, Geoffrey | SS | Free Agent | 27 | 07/31/1991 | Los Angeles | USA | Right | Right | 6' 0" | 185 lbs | - |
| McDonald, John | 2B | Saskatoon Smokin' Guns | 23 | 12/27/1995 | Santa Clarita | USA | Right | Right | 5' 11" | 160 lbs | - |
| McElroy, Sidney | MR | Chula Vista Tacos | 20 | 02/08/1998 | New York | USA | Left | Right | 6' 0" | 200 lbs | - |
| McKay, Dylan | 1B | Free Agent | 27 | 03/06/1991 | Florence | USA | Right | Right | 5' 10" | 214 lbs | - |
| McQueen, Lance | 2B | Chula Vista Tacos | 24 | 11/22/1994 | New York | USA | Right | Right | 5' 10" | 165 lbs | - |
| Medina, Javier | CF | Free Agent | 24 | 05/26/1994 | Santo Domingo | DOM | Switch | Right | 6' 0" | 190 lbs | - |
| Meyer, Allen | SP | Free Agent | 32 | 01/07/1986 | Edison | USA | Right | Right | 6' 2" | 209 lbs | - |
| Miller, Chris | C | Free Agent | 28 | 05/31/1990 | El Campo | USA | Right | Right | 6' 3" | 208 lbs | - |
| Miller, David | MR | Free Agent | 30 | 12/20/1988 | East Palo Alto | USA | Right | Right | 6' 1" | 207 lbs | - |
| Miller, Michael | CF | Free Agent | 31 | 05/12/1987 | Mount Prospect | USA | Right | Right | 6' 4" | 224 lbs | - |
| Moisan, Daniel | 2B | Free Agent | 23 | 07/10/1995 | Oshawa | CAN | Right | Right | 5' 11" | 170 lbs | - |
| Money, George | MR | Seattle Rainiers | 20 | 02/21/1998 | Lawrence | USA | Right | Right | 5' 10" | 237 lbs | - |
| Montoya, Jorge | SS | Seattle Rainiers | 18 | 01/05/2000 | Bayamo | CUB | Right | Right | 6' 0" | 210 lbs | - |
| Moon, Jonathan | MR | Free Agent | 25 | 04/23/1993 | Boca del Mar | USA | Right | Right | 6' 4" | 215 lbs | - |
| Morán, José | C | Colorado Commanders | 26 | 08/22/1992 | Azua | DOM | Switch | Right | 6' 0" | 215 lbs | - |
| Morán, Rafael | MR | Saskatoon Smokin' Guns | 29 | 07/05/1989 | Caimito del Guayabal | CUB | Left | Right | 6' 0" | 244 lbs | - |
| Moreno, Juan | SP | Saskatoon Smokin' Guns | 24 | 12/19/1994 | Oakley | USA | Right | Right | 6' 2" | 235 lbs | - |
| Morishita, Katsumi | C | Surrey Sinners | 20 | 09/06/1998 | Urayasu | JPN | Left | Left | 6' 5" | 235 lbs | - |
| Muñóz, Héctor | SP | Jasper Cougars | 24 | 06/27/1994 | Warwick | USA | Switch | Left | 6' 2" | 210 lbs | - |
